Patrick b



A (No Model.) i

P. B. DELANY.

RECEIVING APPARATUS FOR CABLE TELBGRAPHY.

.No. 425,597. Patented Apr. 15, 1890.

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UNITED STATES PATENT OFFICE.

PATRICK B. DELANY, OF NEV YORK, N. Y.

RECEIVING APPARATUS FOR CABLE TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 425,597, dated April 15, 1890.

Application filed July 15, 1889. Serial No. 317,502. (No model.)

To all whom it may concern:

Be it known that I, PATRICK B. DELANY, of New York city, county, and State of New York, have invented an Improved Receiving Apparatus for Cable Telegraphy, of which the followlng is a specification.

The invention is intended to be used on lines or cables where the Thomson or siphon recorder is now employed. Its purpose is to provide for the distinct, clear reception of the delicate signals received over such cables by ordinary apparatus, such as is used on landlines and with the received signals of which all operators are familiar.

Generally the invention consists in the use of an oscillating coil substantially such as is used in the Thomson recorder, avibrated contact-finger carried thereby, contacts on opposite sides of its neutral line, across and upon which it plays or with which it makes contact, and ordinary telegraphic receiving apparatus connected with said contacts and vibrated fingerfor instance, a split battery, a polarized relay, and sounder.

In the accompanying drawings, Figure 1 is a plan view, partly in diagram, showing all the parts connected in a line for operation; and Fig.2 is a side view omitting the controlling-vibrator, relay, and sounder.

The invention is specially designed to operate in connection with my system of cable transmission patented to me on November 29, 1887, Nos. 373,967 and 373,968. That system provides for the transmission of impulses of equal duration and alternate polarity and also for the use of regularly alternating, neutralizing, or clearing impulses after the signal or primary impulses to neutralize the static discharge of the cable. The arrangement permits of rapid signaling and a uniformity of movement of the receiver, not,

so far as I am aware, obtainable by any other system.

A indicates the magnet, and B the oscillating coil, through which the line is connected, as ordinarily used in a Thomson recorder. Attached to the coil or bobbin is a light arm or finger 0, preferably made of aluminium on account of its lightness. The end of the finger is bent, so that its point, which is preferably tipped with platinum, will strike or play on either of two metallic contact-plates d (1, preferably faced with platinum, as it swings to either side of a neutral or central position as the coil B oscillates. Between the point of the finger and the coil B an electro-magnet E is located, the circuit of which is interrupted by an automatic vibrator V, whose rate and amplitude of vibration may be changed by shifting an adjustable weight 17 thereon. Directly over the magnet E a small piece of soft iron is attached to the finger, and is attracted by the magnet at each closing of its circuit. WVith proper adjustment the light finger is kept in continuous vibration at right angles to its plane of oscillation, its own elasticity serving to draw it away from the magnet between the periods of magnetization. The object of keeping the arm in constant vibration is to relieve it of friction against the contactplates (1 cl when the coil B is moved by the electrical impulses received over the cable. The point of the finger normally-2'. ea, when no current or signal is coming over the lineoccupies an intermediate or neutral position on the insulation between the two contacts. The contacts are connected with the poles of a local split battery SB, the middle of which is connected to the vibrating finger through a polarized relay PR, that controls alocal circuit, in which is placed a receiveran ordinary sounder, for instance-as shown in the drawings. The contacts of the polarized relay and contacts (l d are shown shunted by condensers, as is usual, to prevent sparking.

If now all the connections be properly made for sending and receiving, the trailer of the transmitter at the sending-station will normally rest on a disconnected or neutral segment or space when the key is up, as fully set forth in my prior patent mentioned, and the finger O of the receiver will vibrate on the neutral space between the contacts cl (1. The tongue of the polarized relay in the circuit of the finger will be against its disconnected limit post or stop, and the soundercircuit will be open. If the distant transmitting operator now closes his key, a current of reaches its down limit.

overcome by the delicate swinging coil.

positive polarity will be sent into the cable through the trailer of the transmitter and the segment on which it rests, the impulse being automatically terminated as soon as the key The effect of this impulse atthe receiving-station is to cause the suspended coil 13 to turn upon its aXis say to the rightand the point of the vibrating finger leaves the neutral space and vibrates on the segment (1, completing the local of the polarized relay, reversing the position of its armature, and closing the sounder-circuit. If the sending-operator is transmitting a dot, he raises his key promptly in the ordinary manner, and a negative current of the same duration as the preceding positive current is sent into the cable. The effect of this negative impulse at the receiver is to cause the coil and vibrating finger to quickly swing to the left-hand segment d, reverse the polarized relay, and open the sounder-circuit, thus denoting a dot on the sounder. If the transmitters key be left up, the vibrating finger assumes the neutral position, and the tongue of the polarized relay remains where last placed and sounder-circuit is open. If the sending-operator desires to send a dash, he simply holds down his key, as usual. The transmitted impulse is of no longer duration than that used for the dot. The vibrating finger swings to the right, as before, actuating the polarized relay and closing the sounder-circuit, which remains closed as long as the key is held down, and a reverse or negative impulse is not transmitted. The vibrating finger returns to the neutral position slowly, owing to the tailing or gradual diminution of the current in the cable. In this manner dots and dashes forming signals are received in the usual way by ordinary land-line receiving device, a sounder being shown.

The usual sliding weights 1) Z) tend to hold the coil in the neutral position, and the contacts (Z d are carried on a laterally-movable block adjusted by a screw D, so that the neutral space may readily be brought under the point of the finger. The vibrator-magnet E is vertically adjustable with reference to the finger. It is carried by a cross-bar E that works on vertical pins in the bed-plate, springs being provided between the cross-bar and bed-plate, and nuts on the ends of the pins afford the means of adjustment.

It will be plain that in the operation of this receiver only a slight resistance has to be In the ordinary recorder the coil has to move a siphon that has one end in an ink-pot over the comparatively rough surface of the paper-receiving strip. 111 my instrument the coil is not incumbered to such an extent.

l/Vhen in the claims I speak of the faces of the contacts d (1' being parallel with the plane of oscillation of the finger, I do not mean that they must be absolutely so, or

that the contacts must have plane surfaces; but I mean that the contacts are such and their arrangement is such that the finger in oscillating can pass across or part Way across or over the contacts and play upon their faces as it is vibrated.

The extent of oscillation of the arm need be but very slight, and the force and frequency of its impact against the contactplates may be regulated by the adjustment of the controlling-vibrator and the magnet E.

I claim as my invention- 1. The combination, substantially as set forth, with the oscillating coil, of the vibrated finger oscillated thereby, said finger vibratin circuit with the finger and contacts.

2. The combination, substantially as set forth, of the magnet A, the oscillating coil, the finger oscillated thereby, the vibrator magnet, its circuit, and vibrator for vibrating the finger in a plane at right angles to its plane of oscillation, two contacts, as (Z d, upon which the finger plays, separated by a neutral space, upon which the finger plays when in the middle or neutral position, a divided battery having its poles connected with said contacts, a polarized relay, through which the middle of the battery is connected with the finger, and receiving devices, as a sounder, actuated by the relay.

3. The combination, substantially as set forth, of the oscillating coil, the finger oscillated thereby, the contacts cl (1, having their faces in a plane parallel with the plane of oscillation of: the finger upon which the finger plays, and contact-moving devices for adjusting the contacts with reference to the finger.

4:. The combination, substantially as set forth, of the oscillating coil, the finger oscillated thereby, the contacts d cl, upon which the finger plays, the adjustable magnet for vibrating the finger at right angles to its plane of oscillation.

5. The combination, substantially as set forth, of the magnet A, the suspended or pivoted oscillating coil, the finger oscillated thereby, the contacts, as d 61, having their faces in a plane parallel with the plane of oscillation of the finger, With which the finger makes contact, respectively, when moved to either side of a neutral position, and telegraphic receiving devices whose circuit is completed by contact between the finger and said contacts.

6. The combination, with the actuated coil or armature of a telegraph receiving-instrument, of an oscillated vibrated arm, whose planes of vibration are transverse to the plane of oscillation, a neutral point where the vibrating arm normally plays, and electrically=connected contacts on either side of the neutral point,having their faces in a plane of the finger and at right angles to its plane parallel with the plane of oscillation. of vibration. I

7. Thecombination, substantially as set In testimony whereof I have hereunto subforth, with the actuated coil or-armature of scribed my name.

5 a telegraph receiving-instrument, of an oscil- PATRICK B. DELANY.

lated vibrated arm, and acontact upon which Witnesses: the arm plays, said contact having its face in EDWD. A. OALAHAN,

a plane parallel with the plane of oscillation CHAS. O. ZUKSOHWERDT. 

